They had a mail service, although it was for official use only.
建立了邮政系统，虽然只供官方使用。
The actual official use that you can make of it is comparing it against null or comparing two USNs for less than, greater than, or equal values.
它的正式用法包括将USN 与null 进行比较，或在两个 USN值之间进行比较，以得出它们的小于、等于和大于关系。
The consular bag may contain only official correspondence and documents or articles intended for official use and must be sealed and bear visible external marks of its character.
领事邮袋以装载来往公文、公务文件及公务用品为限，应予加封并附有可资识别的外部标记。
A Mass of simple ceremony that was recited rather than sung by the priest. No longer in official use.
平时小弥撒：简单仪式的弥撒，是由牧师背诵而不是唱出来的。现在不再被正式使用。
A Mass of simple ceremony that was recited rather than sung by the priest. No longer in official use.
简单仪式的弥撒，是由牧师背诵而不是唱出来的。现在不再被正式使用。
A written commitment that the property purchased by an overseas institution is for the actual official use.
境外机构所购房屋是实际办公所需的书面承诺。
A written commitment that the property purchased by an overseas institution is for the actual official use.
境外机构所购房屋是实际办公所需的书面承诺。
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